/** */
package io.libp2p.discovery.mdns.impl.constants;

/**
 * DNS option code.
 *
 * @author Arthur van Hoff, Pierre Frisch, Rick Blair
 */
public enum DNSOptionCode {

  /** Token */
  Unknown("Unknown", 65535),
  /** Long-Lived Queries Option [http://files.dns-sd.org/draft-sekar-dns-llq.txt] */
  LLQ("LLQ", 1),
  /** Update Leases Option [http://files.dns-sd.org/draft-sekar-dns-ul.txt] */
  UL("UL", 2),
  /** Name Server Identifier Option [RFC5001] */
  NSID("NSID", 3),
  /** Owner Option [draft-cheshire-edns0-owner-option] */
  Owner("Owner", 4);

  private final String _externalName;

  private final int _index;

  DNSOptionCode(String name, int index) {
    _externalName = name;
    _index = index;
  }

  /**
   * Return the string representation of this type
   *
   * @return String
   */
  public String externalName() {
    return _externalName;
  }

  /**
   * Return the numeric value of this type
   *
   * @return String
   */
  public int indexValue() {
    return _index;
  }

  /**
   * @param optioncode
   * @return label
   */
  public static DNSOptionCode resultCodeForFlags(int optioncode) {
    int maskedIndex = optioncode;
    for (DNSOptionCode aCode : DNSOptionCode.values()) {
      if (aCode._index == maskedIndex) return aCode;
    }
    return Unknown;
  }

  @Override
  public String toString() {
    return this.name() + " index " + this.indexValue();
  }
}
